Multi-Active Handling Procedure; Lacp Mad - HPE FlexNetwork HSR6800 Configuration Manual

Multi-active handling procedure

The multi-active handling procedure includes detection, collision handling and failure recovery.
Detection
The MAD implementation of this device detects active IRF fabrics with the same Layer 3 global
configuration by extending the LACP, BFD, or gratuitous ARP protocol.
These MAD mechanisms identify each IRF fabric with a domain ID and an active ID (the member ID
of the master). If multiple active IDs are detected in a domain, MAD determines that an IRF collision
or split has occurred.
You can use at least one of these mechanisms in an IRF fabric, depending on your network topology.
For a comparison of these MAD mechanisms, see
Collision handling
When multiple identical active IRF fabrics are detected, MAD compares the member IDs of their
masters. If the master in one IRF fabric has the lowest member ID among all the masters, the
members in the fabric continue to operate in Detect state and forward traffic. MAD sets all the other
IRF fabrics in Recovery (disabled) state and shuts down all their physical ports but the console ports,
physical IRF ports, and any ports you have specified with the mad exclude interface command.
The Detect-state IRF fabric is active. The Recovery-state IRF fabric is inactive. Only members in the
Detect-state fabric can continue to forward traffic.
Failure recovery
To merge two split IRF fabrics, first repair the failed IRF link and remove the IRF link failure.
If the IRF fabric in Recovery state fails before the failure is recovered, repair the failed IRF fabric and
the failed IRF link.
If the active IRF fabric fails before the failure is recovered, enable the inactive IRF fabric to take over
the active IRF fabric and protect services from being affected. After that, recover the MAD failure.

LACP MAD

LACP MAD requires that every IRF member have a link with an intermediate device, and all these
links form a dynamic link aggregation group, as shown in
device must be an HPE device that supports extended LACP for MAD.
The IRF member devices send extended LACPDUs with TLVs that convey the domain ID and the
active ID of the IRF fabric. The intermediate device transparently forwards the extended LACPDUs
received from one member device to all the other member devices:
•
If the domain IDs and the active IDs in the extended LACPDUs sent by all the member devices
are the same, the IRF fabric is integrated.
•
If the extended LACPDUs convey the same domain ID but different active IDs, a split has
occurred. To handle this situation, LACP MAD sets the IRF fabric with higher active ID in
Recovery state, and shuts down all its physical ports except for the console ports, IRF ports,
and any ports you have specified with the mad exclude interface command. The IRF fabric
with lower active ID is still in Detect state and forwards traffic.
"Configuring MAD."
Figure
7
6. In addition, the intermediate